Grinding machine



Sept. 9 1924.

T. J. STURTEVANT GRINDING MACHINE Filed Feb. 26,. 1924 3 Sl'uieiLs-Sl'lee1 l nvV'LNToR:4 f

ATTORNEY.

Sept. 9 1924.

T. J. STURTEVANT GRINDING MACHINE Filed Feb. 2e

1924 3 Sheets-Shabat 2 O IN VENTOR.

A TTORNE Y.

.i m a \/L ma 9 9 r m Sept. 9 ,'1924. `1,507,629 T. J. sTURTEvAN'r GRINDING MACHINE Filed Feb. 26 1924 3 Shadi-Sheet 5 Patented sept.. 9, 1924i onUsErrs.

Parr.NTy oFF THOMAS J. srURTEvANT, or wEL'LEsLnY, MAssAoHUsETTs,"Assreuonm'o s-'rUR'rE- vANT MILL COMPANY, or Bos-TON, MASSACHUSETTS, ,fi/CORPORATION ory MASSA- GRINDING MACHINE.

Application led'February 26,1924. SerialNo. 655,226.

To @ZZ-whom t may concern:

Be/'it known vthat I',"IHOMAs J.` STURTE- vANT, acitizenof the United States, residing at Wellesley, inthe county of Norfolk and State of Massachusetts, have invented certain new and :useful Improvements in Grinding Machines,'of which the followingl is a specification.

The invention to be hereinafter described relates to machines for grinding or reducing coal and other materials.

rIhis .machine in its broad aspect comprises a rotary carrier having a ringrunner or tire thereon, Ea rotary carrier having ments moved by the Vpushers in an orbit within the ring runner, and adapted to reduce material introduced'to the inner surface of the runner. These carriersl may rotate about'a horizontal axis and at'adierential speed, with` the same `direction of rotation or with opposite directions of rotation. Y

Heretofore, so far as I am aware, in mills of this .general type, the ringfwithin which the balls revolvehas been fixed. As a conse-` quence, a layer of lmaterial' tobe groundl was not maintained on the innery surface of the ring throughout the circumference. thereof. Therefore, the-balls in travellingy through `their orbit', would intermittently engage material `.andthe inner surface of the ring, and would have a pounding'actionfon the ring resulting in objectionable .wear lon `the pushers, balls and'ring. 'Y

One of he" purposes of the present'invention is to provide a millwhichvovercomes this objection The ring runneris rotated and at a sufficient-speed to' producea centrifugal yeffect which will-'maintain 'a'slayer of material' to be ground "throughout-the circumference' of Ithe "inner surface" ofk the runner. Therefore, inaction the-balls noru mally -will engage material on tlieiunner, and'will'not poundI and igrind,against X'the runner. Thus; the Vlife of the pushers, yballs and-runner Vis materially prolonged." `The pusher-s arerotated 'at sufficient. speed to cause' the'balls -to press outward toward the rrfmner'under'- vthe infiuence off centrifugal force with the desired `grinding-action, but t-he'ballsl do notk need -to be revolved'with so great'a relative speed with respect to the runner as heretofore has been llQQessary.' As

pushers thereon, and grinding balls or ele-VV aconsequenceythere isla further reduction in the wear on` the balls and the ring.

However, these mills arek bound to receive hard usage, so thaty it is necessary fromtime to 'time' to` substitute new push'ers andv :balls and a new ring runneror tire for old ones. Another purposev of 'the invention',.there fore,lis to provide a construction whichwill enable ready' access to the pushers, balls and runner for the purpose of removing the worn vones from the machine and subst-ituting'new onestherefor. In carrying this'feature of the invention into practical effect, in' the presentY instance, the carriers for the runner and the balls are mounted on portions of shafts which overhang or project beyond the bearing Support therefor, and'pthe carriers are enclosed in a casing provided with a hinged'cloonwhiclrmay be readily swung to .open position so as to expose'V and render conveniently accessible the parts within the-casing.vv L f '1 `With the aforesaid and otherpurposesin view, the character of the' invention may Abe best understood .from the following descrip- -tlon of one good form of` the' invention vshown 1n thel accompanying drawings, wherein: I

F ig. l is a vvertical longitudinalv section through the machine; c

Fig. 2 on an enlarged scale is a vertical transverse section-v taken on line` .2f-e2 Aof l`ig.1;'f f l "Fig: 3 is a plan of the casing containing the ring runner, pushers and balls;

F ig. t is an end elevation of the 'machine with the door ofthe casing open and" dis-` closing parts within' the casing;y and Fig. kf3' onan enlarged scaleiis a vertical transverse .section taken on `line 5 5 of Fillfl. y' .I i 4 '1 Referring to the drawings, the machine shown thereinv as one `good form of the in-v vention, lmay have any vsuitable support, in

`thepresent instance,comprising a pair of longitudinal `bed members V1 supporting a pair of Stands 3 vbridging the bed members 1- at the ends thereof and secured Athereto-by rbolts 5. Each ofthe standsy is formedlto provide half vof a bearing 7, and a cap i9 provides the other half of the bearing, said jcapy being detachably secured to the stand by bolts 11.. Thebearingsthus formed are provided with Babbitt metal linings. 13.

Journalled in the bea-rings 7 is an outer sleeve shaft 15 which is prevented from movement in the directio-n of the axis thereof by a flange 17 formed on the shaft at one side of the right 'bearing 7, and a collar 19 fast on the shaft at the opposite side of said bearing. The left end of said shafthas an outstanding flange 21 to which is secured a pulley 23 adapted to be driven by a belt from any suitable source of power.

The right end portion of the shaft overhangs or projects outward beyond the right bearing 7, and ha-s an outstanding flange 25 towhich is secured "a carrier' or head 27. This carrier comprises a hub 29 recessed to receive the shaft flange 25 and secured thereto by bolts 31. Projecting outward from the hub are arms 33 carrying a rim 35 provided with a tapered inner surface 37. Fitted into this rim is a ring runner ortire 39 removably secured t-othe head by bolts 41. The construction is such that the bolts may be readily removed to permit the tire 39 to be detached from the head when it is desired to substitute a new one therefor.

Mounted in the hollow shaft 15 adjacent the opposite ends thereof are roller bearings 42 comprising raceways 43 and rollers 45 therein. To lubricate the roller bearing adjacent the right end of the shaft, the collar 19 referred to, is tapped to .receive the necks of a pair of diainetrically opposed grease cups 47 communica-ting with radial ports 49 in the shaft 15. These ports iii i turn communicate with a circumferential vided with longitudinal ducts 55 which lead from the groove 51 to the roller bearing at the right end of the shaft.

To lubricater the roller bearing at the left end of the shaft, the latter may be tapped to receive the neck of a grease cup 57 leading to a circumferential groove 59 in said shaft surrounding the bearing. The bearings 7 for the shaft 15 may be lubricated by grease cups 61 mounted in the caps 9.

Jour-nailed in the roller' bearings 42 is an inner shaft 63 having an end portion projecting through and beyond the pulley 23 and having fast thereon a! pulley 65 adapted to be driven by a belt from any suitable source of power. This inner shaft is prevented from axial movement to-ward the right by a collar 67 fast thereon engaging the hub of the pulley 23. Y To prevent the lubricant from working from the right roller bea-ring 45 toward the left along the shaft 63, the latter may be provided with a helical groove 69 which on rotation of the shaft will tend tol feed the lubricant toward the right.`

The right end portion of the inner shaft 63 projects beyond the outer shaft, and has fast thereona head or carrier 71 having a hub 73 with a tapered bore on a tapered end of the shaft 63, and secured thereto by a nut 75. Projecting `outward from the hub.

73 is a disk 77 havin()r studs 79extending laterally therefrom ofD substantially trapezoidal section. The disk has a flange 81 projecting laterally therefrom overlapping a collar 82 fast in the end of the outer shaft.

A washer 83 is interposed between the hub of the head and the collar 82. Axial movement of the inner shaft toward the left is prevented by engagement of the hub with the washer. Lubricant may reach the washer through duets 85 in the collar 82 extending from the adjacent roller bearing to -tlie washer. Suitable packing 86 may be outer portions relativelythick'y as compared i.

to the portions nearer the shaft on which the pusher head is mounted. The curved sides of the pusher are grooved to limit lateral movements ofthe grinding'elenients to be described.

Ther .pushers are removably held on the studs 79, .in the present-instance, by a ring 91 engaging the ends ofthe studs and secured thereto by through bolts 93 entered through the studs and ring. The 'construction is such that when it is desired to substitute new pushers for worn ones, it is merely necessary to release the nuts from the bolts 93 and withdraw the ring 91 from the bolts. lhereupon,` the pushers may be readily slid off from the studs.

Between the pushers are grinding balls or elements 94. lIn the present instance they are free and are moved in an orbit by the i pushers and` at a speed ysuiiicient to cause them to move outward `under the influence of centrifugal force and exert the required grinding pressure.

The ring runner head, pusher head, pushers and balls are enclosed by a casing 95 having a wall 96 secured to the ends of the bed members 1 referred to. This wall is apertured to receive the end portions of the outer' and yinner shafts which project'be yond the right bearing 7. A collar 97 secured tok the wall 96. projects inward from the aperture to the shaft `flange 17, referred to, on the outer shaft to prevent escape of CII ducted through the chute and mouth,"'and be delivered thereby to the inner surface of the ringfrunner 39. When itis desired to have 'access tothe partswit'hin the casingffor the purpose of inspection or replacement of parts therein, the door may b'e readily swung' the pusher head maybe rotatedin thef'same direction, but' the pusher head is'rotated at a higher speed than the'runner head," so that theb'alls yWill be pushed in an orbit relatively to the runner,` and vWillpress outward `'under theinfluence of centrifugal force, and reduce material introduced to the runner.

The vrunneris rotated at `a vspeed to develop v sufficient centrifugal force to `maintain a `layer'of material throughout the circumference of-the'inner surface thereof. Under 'certainconditions the runner headand the pusher head'may be 'rotated in opposite directions, andth'epusher yheadmay be'rota'ted at a speed merely sulicientito cause the balls vto move outward with the-pressure required.

lIt `Will'be noted thatthe runner head and the'pusher head are on'portions of the shafts projecting beyond the right stand` 3, andthe driving Apulleys'for said shafts are' on 'end "portions'thereof projecting beyond the left standB. Thus, a balancing effect is'providzed which reduces the friction land Wearo'n the bearings and contributes to theeliciency of operation of th'e mill. Any Wear which 'Would-tend to lcause looseness of 'the vouter lshaft in the bearings? 4Will not affect the relation'of the inner 'shaft Withrespect to the outer shaft, since ythe-former isjournalled in bearingsin the latter.

Then Ethe grinding balls are moved out- -Ward under the influence of centrifugal force, 1'they 'will be Aenga-ged by the thicker portionsofthefpushe'rs lWhich Will stand considerable Wear. vWhen thethicker portion at one side offa pusher becomes worn, it may be y'reversed on its stud lend-for-end, so thatV the oppositeside ofthe pusher Will be in active frictional engagement with Ythe ball. Vhe'n both sides lof 4a 'pusher have "been Worn down, litmay be readily removed and 'a newone'substitiited therefor as described.-

The casing is formed of upper and lower parts 107'v and '109 `ldetachably secured together by .bolts rlll '(Fig. 2)', and as Vstated the bearings 7 have detachable caps 9. The 'construction'i's suchthat in assembling the 'machine, the shaft may ,be readilylowered into theibea-ri'ngs and thentlie capsA and the upper pai-tof the 'casing maybe 'set in place.

The capsfand theupper part iofthe:casing maybevreadily 'removed' thereby` to permit 'lifting of the" s`li`aft fro'mits bearings if *desired.

n 'Win be noted 'that ihem'o'uuilofihe chute' is 'disposed to deliver materialadj acent the end'fof'the shaft. The consequence'is that n'iaterial mayfcome bet-'Ween the "balls 'and the 'pushers, `Ithereby reducing Wear thereon ta'nd contributing to' reducing of the materia-1. *v i -B 'y my invention is :provided 'a I grinding `mill ywhich is simple andstrong'in 'construction'. lThe parts in Vthe casing are Ireadily 'accessible forthe"purposeY of'inspe'ction, ad-

justment "and replacement thereof, and the construction issuch that the ive-arjen the push'ers, balls and ring is materially vless than 4'n'mills 'of this type heretoforefused. u

f [t .'Will Lbe Iunderstoodv that the invention is not limited Ytothe speefic embodiment shown, f and 'that variousd'eviatio'ns may be m'adeftherefrom' Without departing from the spirit and scope of the yappended claims. Whatis claimed is': l. A grindingx machine comprising, in combination, Aa.v suppe-rt having bearings, an

outer slee-ve shaft j ourhalled'inl saidbear'ings Eand havingg a free end portion projecting 'beyond -o-ne offsa'id bearings, iahead fast' on "the" endvportion ofv said shaft, a 'ring'Y run- 'ner carried by *said head," an 'iiiner's'haft in said sleeve shaft and,l proj ecting'l beyond the vend portion thereof, afpuslierfhead fast on, vthe inner shaft, 'pushers carried by the pusher head, 'and' free' grinding balls `adapted to be pushed 1along^the ri'innerbyYV the pushers throughout anA `o'ifbit 'and `urged to- `'Ward the run-Iier by centrifugal fr'c'e, 'and means 4to y'guide materialf toy thel runner 'that Lit '-"runnei l y v *grinding Afinafchirle, ebrnpising in combination, a Ahead "havin'g'ia ringfrunner. thereon, head hayingstuds projecting laterally therefrom, pu'she'rs, ffremoyabily 'be- 'ground between the 5 balls andthe mounted on 4said stuc'ls, 'free grinding ele- 'ments adapted to; v"be-Wmoved in an fior-bit the 4"piishers and thrown toward,V the "runner b'y centrifugal lfore-eY on irot'ati'onbfthe j pushe-n and a, casing for 'the aforesaid lvvgparts having a door 'largert'han the runner adapted to l bel opened l'to'v'efzpo'sevand'frender readilyaccessible the pushers'to permitre- ,A vinovalf-tl1'e,re1 'f 'from thefstudsfand permit removal of' the Iring runner "from tthe head.

.A grinding :machine-femmes.. .in combination, a sup-port havinglbealr'i'ngs'an y'outer 'sleeveshaft journalledi'n saidfbear`` ings, van 'inner vshaft in 'the 'outer shaft, a

head'jon 'the outer shaft having a ri'ngfrunner thereon, ahead 'on theI inner shaftjhaving studs projectingv therefrom', p'ushe-rsfo'n the studs, a ring detachably secured tov/the 1.30

`ends of the studsfor holding the pus'hers thereon, and grinding elements between the pushers and adapted to be revolved thereby in an orbit within the runner to grind material introduced between them.

4. A grinding machine comprising, in combination, a support having bearings, an outer sleeve shaft journalled inV said bearings and having free end portions projecting beyond said bearings, an inner shaft journalled in the outer shaft and having free end portions projecting beyondthe end portions of the outer shaft, a head lonone end portion of the outer shaft and having a ring runner thereon, a. head on lone end portion of the inner shaft within the runner head, pushers carried by the inner head, grinding elements between the pushers and adapted to be moved thereby in an orbit within the ring runner to grind material introduced between them, and driving pulleys on vthe end portions of said lshafts opposite to the end portions carrying said heads.

5. A grinding machine comprising, in combination, a support having bearings, an outer sleeve shaft journalled in said bearings and having a free end portion projecting beyond one of said bearings, a head on said end portion having a ring runner thereon, an inner shaft jo-urnalled in bearings in the outer shaft and having a free end portion projecting beyond said end portion o-f the outer shaft, a head on said end portion ofthe inner shaft, pushers on the inner shaft head, grinding balls between the pushers and adapted to be moved thereby in an orbit within the runner, means tointroduce materials to be gro-und between the runner and balls, and means to prevent dust from working along the end portions of said shafts to the bearings adjacent thereto.

6. A grinding machine comprising, in combination, a support having bearings, an outer shaft jouralled in said bearings and having end portions projecting beyond said bearings, an inner shaft journalled in bearings in the outer shaft and having end portions projectingbeyond the end portions of the outer shaft, a head on one end portion of the outer shaft,- a pulley on the opposite end portion of said shaft, a ring runner carried bysaid head, a head on. one end portion of the inner shaftA within the ring runner and having pushers thereon, a pulley on the opposite yend portion of the inner shaft, grinding balls between the pushers and adapted to Vbe revolved thereby in an orbit within the ring runner, and a casing enclosing said heads having a door larger than the runner and carrying a chute for conducting material to be ground to the runner, said door when open exposingl the runner, pushers and balls to permit'ready introduction of the same int-o operablev position and remo-val` therefrom.

7. A lgrinding machine comprising, in

combination, a support having bearings, a horizontal outer shaft journalled in said bearings and having an end portion projecting beyond one lofsaid bearings, ahead on said shaft having a ring runner thereon in plane transverseto the axis of said shaft, an inner shaft in said outer shaft and having an end portion projecting beyond the ond portion of the outer shaft, a head `'as shaft, pushers carried by said head, and grinding vballs between the pushers and.

mounted on the end portion of the inner movable from the carrier for the -pushers in;

a direction transverse' to the plane of the ring runner and .independently of land without displacing the other pushers.

9. A grinding Amachine commprising,` lin, combination, a rotary' carrier, a ring runner'l thereon, a` second rotaryv car 1ier, pushers thereon, free grinding elements adapted @to b-e moved inv an orbit by kthepushersand adapted to be thrown toward the runner by centrifugal force, each of said-pushers be-l ing removable fromthe carrier for the pushers independently of the other pushers, and

`eac-hof the pushersl having a pair .of opposed faces, each singly for act-ive pushing engage-- ment with an element, the pusher' being4 reversible to present one o-f said faces for active ,pushing engagement with the element when its other face hasbecome'worn. i n

l0. A grinding machine comprising,in combination, a rotary carrier, a ring .runner mounted thereon, a second rotary c( rrier, pushers removably `mounted thereon, freey grinding elements adapted to be moved in an orbit by the pushers and. adapted to be thrown toward -the lrunner by centrifugal force, and a easing for said parts. havingI a f door sufficiently large tol permit removal of the ring, pushers and e-lements from the casing, said door having av chute thereon provided with a mouth for `delivering-inaterials centrally Vof the orbit of the grinding elements.

11. A grinding machine comprising,` in combination, a rotary carrier, a ringrunner mounted thereon, a rotary carrier having studs projecting therefiomin directions substantially parallel to the axes of said carriers, pushers mounted on said studs, and free grinding elements between the pushers adapted to be moved in an orbit by the pushers and be thrown toward they runner by centrifugal force on rotation of the pusher carrier, said pushers being independently removable from their studs.

12. A grinding machine eomprising, in combination, a support having a pair of bearings spaced a. substantial distance apart, a sleeve shaft journalled in said bearings and having a free end portion projecting beyond one ofsaid bearings, a carrier on said sleeve shaft, a ring runner secured to the carrie-r, an inner shaft mounted in the sleeve shaft and having a. free end portion projecting beyond the free end portion of the sleeve shaft, a carrier on the. inne-r shaft having studs, pushers on the studs, means for holding the pushers on the studs and having provision permitting removal of the pushers from the studs, grinding balls between the pushers and adapted to be moved in an orbit by the pushers kand be thro-Wn toward the inner surface of the runner by centrifugal force on rotation of the pusher carrier, and

means for delivering materials to the runner ring that they may be balls and ring.

153; A grinding machine comprising, in combination, a support having bearings, an outer sleeve shaft ournalled in said bearings,

ground between the and having free end portions projecting be`- yond said bearings, an inner' shaft journalled in the outer shaft and having free end portions projecting beyond the end portions of the outer shaft, a carrier on one end portion ofthe outer shaft and having a ring runner thereon, a carrier on oney end portion of the inner shaft Within the ring runner, pus-hers carried by the latter carrier, grinding ele-k ments adapted to be moved by the pushers in an orbit Within the ring runner `to grindv the material introduced between them, and driving means on the end portions ofsaid.

shafts opposed to the end portions on which the carriers are mounted. i

la. A grinding machine comprising,v in combination, -a support having bearings, a horizontal sleeve shaft journalled in saidV bearings, a carrier on said shaft, aring runner mounted on the carrier, an inner shaft in the'sleeve shaft, a carrier on the inner shaft having.supporting members projecting laterally therefrom, pnshers on said members and adapted to be slid laterally olf from said members, and grinding elements adapted to be moved in an orbit by the push- `ers and to be thrown ,to-Ward the inner surface of the ring runner by centrifugal force.

THOMAS J. STURTEVANT, 

